Conical lock washer



Oct. 26 1926. 1,604,122

R. T. HOSKING CONI CAL LOCK WASHER Filed Feb 14, 1925 ATTORNE Y deviceconsists in a conicalsheet me Patented Oct. 26, 1926.

UNITED STATES PATENT OFFICE.

RICHARD T. HOSKING, OF WILMETTE, ILLINOIS, ASSIGNOR TO K. R. HOUGH CO,OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

CONIGAL LOCK WASHER.

Application filed February This invention relates to an improved conicalshaped lock washer for use with countersunk screws and the like. Theimprovement relates to the locking means, and

the present application is a continuation of,

part of my co-pending application, Serial No. 651,797, filed July 16,1923, in which a washer of the same type. having a modified toothstructure is described and claimed.

I provide a locking device whereby the countersunk screw head whenforced tight into the conical washer acts to distort a yieldable memberof the washer. The said members are twisted spring teeth or prongs thatform the ed es of the washer, preferably the outwardIy flaring edges,although the teeth may if desired be on the inwardly flaring edges orsmall diameter of the comcal washer. The lateral edges of the teeth nearthe tips of the teeth are thereby made to bite into the conical surfaceof the screw head and into the countersunk opening in the work, to lockthe screw. 1

With the foregoing and certain other objects in view which will appearlater in the specifications, my invention comprises the devicesdescribed and claimed and the equivalents thereof.

In the drawings, Fig. 1 is a transverse section of my improved ,washer.

Fig. 2 isa top plan view of the same.

Fig. 3 is an enlarged end view of'a twisted tooth. I

As is clearly shown in the drawin 5518 1 having a central aperture 2.The, outer edge, being the edge at the large diameter of the copies.body, teeth 3 that o ect. outwardly and u wardly; in the pre erred form,as shown, e row of teeth conforming in general shape to that of theconical body.

The outer endaor tips axially twisted to an le of a proximate- 1yforty-fivedegreel wit theirnitial position as shown in Fig. 3.

The body of the tooth from its point to itsrootistherebyw theshapeofthetooth at its root HI "I; to the cone shape of the body. y the tooth isformed into a. row of 4 of the'teeth are p 14', 1925. Serial No. 9,146.

at its root fits both the screw head and the countersunk hole in thework.

The tip of each twisted tooth presents, to the face of the screw headand to the work, sharp-edged prongs 5 that project respectively inwardlyand outwardly from the conical inner and outer surfaces of the washer.Of the four longitudinal edges of each tooth two diagonally oppositeones will form the projecting edges just mentioned and the extremitiesof these edges form the sharp edged prongs referred to.

The washers are preferably made of sheet steel stamped and pressed toshape. I prefer to employ tempered clock-spring steel or equivalentmaterial, so that the prongs are not only hard and tough, but are highlresilient. Consequently when the screw head -is tightened into thewasher and the prongs e countersunk washer a lockin device that eectively prevents a conicaleaded screw or bolt from unscrewing, eventhough it is subjected to extreme and long continued vibration.

Having thus described my invention, what I claim and desire to secure byLetters Patent is:

1. A look washer comprising a centrally aperturedconical body, its outeredge shaped to form a row of teeth conforming at their roots to theconical contour of said body, said teeth yieldable and axially twistedat their outer ends.

2. A lock washer compris' a centrall apertured conical body orm of stainand pressed sheet spit-3g metal, the outer edge-of said conical y shapedto form a row of resilient teeth conformingoaat their roots to theconical contour of said and warped from their roots to their points, forthe p set forth.

3. A 001: washer comprising a centrally :gertured conical body, an edgeof said body a ed to form arow of teeth conforming at their roots to theconical contour of said bogg', said teeth axially twisted at their outer4. A look wesher oomp a. substantially cone-shaped body of 's' eetspring metal, resilient projections formed thereon and normallyextending respeotivel inwardly and outwardly from the cone-s aped 10inner and outer surfaces of the washer, for

F the purposes set forth.

In testimonwhereofl I aflix my signature. ICHARD T. HOSKING.

gipertured conical body, an edge of said body a ed to form a row ofteeth conforming at their roots to the conical contour of said bogy,said teeth axially twisted at their outer 5 on s.

4. A lock washer comprising a substantially cone-shaped body of sheetspring metal, resilient projections formed thereon and normallyextending respectivelfi inwardly and outwardly from the cone-s apedinner and outer surface of the washer, for the purposes set forth.

In testimonfiwhereof, I afiix my signature.

' ICHARD T. HOSKING.

DISCLAIMER 6O4,122.R1Zchard T. Basking, Wilmette, Ill. Comcn. LocxWasann. Patent dated October 26, 1926. Disclaimer filed September 20,1939, by the assignee, Illinois Tool Works.

Hereb enters this disclaimer to claims 1, 2, 3, and 4 in saidspecification.

[gflicial Gazette October 10, 1.939.]

DlSOLAI M ER |604,122.Richard T. Hos/ring, Wilmette, I11. CONICAL LOCKWanna. Patent dated October 26, 1926. Disclaimer filed September 20,1939, by the assignee, Illinmls Tool Works. Hereb enters this disclaimerto claims 1, 2, 3, and 4 in said specification.

[({fiaial Gazette October 10, 1939.]

